Screw-cutting device



. A. SIGALUN.

SCREW CUTTING DEVICE.

APPLICATION FILED DEC- 1. 191a Patented Mar. 29, 1921 A. SIGALON.

SCREW CUTTING DEVICE. APPLICATION FILED Dec. 2. ms.

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SCREW CUTTING DEVICE.

APPLICATION FILED DEC-7.1918.

Patented Mar. 29, 1921.

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NORRIS FE'IEHS WC. L1THO., WASHINGTON D C PATENT OFFICE.

ANTOINE SIGALON, OF LYON, FRANCE, ASSIGNOR TO ARMANI) CARRETTE, OFPARIS,

. FRANCE.

SCREW-CUTTING DEVICE.

Specification of Letters Patent.

Patented Mar. 29, 1921.

To ZZ w from it may concern.

Be it known that I, AN'rorNn SIGALON, a citizen of the Republic ofFrance, residing at Lyon, Rhone, 28 Rue Bancel, in the Bepublic ofFrance, engineer, have lnvented certain new and useful Improvements inScrew-Cutting Devices, of which the following is a specification.

This invention has for its object to provide an improved screw-cuttingdevice for cutting screw threads of different diameters, between verywide diametral lnnlts, by means of one and the same set of dies having agiven pitch, the dies that are employed being easily removable andreplaceable by other dies having a different pitch.

By way of example, Figure 1 of the accompanying drawings illustrates an1mproved hand-actuated screw-cutting devlce according to this invention.

Fig. 2 is a cross section thereof on the line 2-2 of Fig. 1.

Figs. 3, 4- and 5 are detail views of the chief parts of this improvedscrewcutting device.

Fig. 6 is a longitudinal section, and Fig. 7 is a section on the line7-7 of Fig. 6, of a power-driven screw-cutting device for a lathe.

Fig. 8 and Fig. 9 are views showing the different positions of the hooksand lever.

The improved manual screw-cutting device, in the form shown in Figs. 1to 5, consists of a circular box or casing a having formed in one piecetherewith two radially extending handles I) for operating the same. Inthe internal cavity of this box a are ar ranged four similar dies 0 oneof which is shown in detail in front and side view in Fig. 5. Each ofthese dies consists of a body part terminating at one end in acylindrical head a serrated at its other end for forming a screw threadof any desired pitch. On one side of the body part of the die is a stud0 The dies have their cylindrical heads 0 seated in bearings d, providedin the interior of the box a, in which they are capable of rocking. Thebox is closed on two sides by plates 6 and g bored concentrically toreceive a screw-blank of the maximum diameter for which thescrew-cutting device is made. The plate 6 is seated in the margin ofsaid box so as to be freely rotatable therein on its own axis. Thisplate is held in place by a ring 7. The plate g closes the lower side ofthe box, and has two stems d that extendthrough the plate e. Two millednuts 2' are screwed on these stems and serve to hold. the plate 9 inplace but allow of its easy removal. The plate a has four tangentialslots j in which the studs 0 of the dies extend, and by the rotation ofthe plate a on its own axis, the dies are caused to move their serratedends toward or away from one another. This adjustment of the dies in thebearings (Z of the box, enables a screw-thread to be cut of any sizewithin predetermined limits. The rotation of the plate 6 and the fixingof the sen]. plate for the purpose of maintaining the dies at a givenadjustment, are effected by the following means In the said plate 6 anddisposed axially at right angles thereto there is fixed. a screw is. Atanother point against the exterior surface of the box a there isprovided a bracket Z in which is rotatably mounted a stud m ending in ahead that is apertured and internally threaded to a nut for a screw n,this screw being actuated by means of a milled head 7? This screw H isterminated at its other end by a hook at which is adapted to engage thescrew 70 of the plate 6. ()n the contrary when the lever is brought intothe position shown in Fig. 9, the stud 0 will drive back the hook a andthe latter will. therefore set free the screw K, whereby the screw itcan be pivoted upon its support Z. The comb-shaped members can then beinstantly separated to disengage the drawplate.

The diameter to which each adjustment of the dies corresponds may beindicated on a scale (not shown) carried by the ring f, and pointer or amicrometer index may be engraved on the plate 6 and serve as a registermark for indicating the divisions of the seals.

By removing the plate 9 it is easy to withdraw the dies either forcleaning purposes or for substituting therefor other dies of a differentpitch.

For its application to lathes the improved screw cutting device may bemodified in the manner shown in Figs. 6 and 7 According to thisconstruction, the body part a of the screw-cutting device ends in a tailor sleeve 0? held by the lathe. In front of this body part there isprovided an annulus 1' that contains bearings wherein the dies 0 arepivoted. The rotation of this annulus causes the dies to swing outward,the studs 0 of these latter beingengaged in slots 7' formed in the bodypart a The annulus 1" is fixed to a sleeve 8 that surrounds the bodypart a and is held by spurs t engaging in slots a that allow the sleeve8 to rotate. The adjustment of the dies to the diameter of the screwthread to be cut, is effected, as in the hand actuated screw-cuttingdevice, by means of a screw n threaded in a pivotally mounted nutcarried by the body part a The screw 11, has a hook 113, which engageswith a screw 70 carried by the sleeve 8. The disengagement of the hookis effected by the rotation of the spur 0 the movement of which can beeasily produced automatically by an adjustable rod 0 being caused toabut against a stop that rotates with the spindle or the lathe and isadjusted to open the screw-cutting device after a determined traverse.

The removal of the dies is effected by withdrawing a plate g that isheld by nuts 2' screwed on the bolts 72,

' Having now particularly described the construction and operation of mysaid invention, I declare that what I claim is 1. A screw-cutting devicecomprising screw-cutting dies, a casing formed in its internal peripherywith bearings for the screw-cutting dies, each die having its outer endpivoted in one of said bearings and being provided on one side with astud, an annular disk mounted rotatably on the said casing and beingformed with slots wherein the said studs of the dies are slidablycngaged, and means including a screw and a nut for maintaining the saiddisk in different adjustments relative to the said casing, the saidscrew having a head on one end and a hook on its opposite end, the saiddisk being provided with a projection adapted to be engaged by said hookof the said screw.

2. In a screw-cutting device the combination of a casing, an annulardisk mounted rotatably on the said casing and formed with slots,screw-cutting dies pivoted in the said casing, each of said dies beingformed with a stud, these studs being respectively engaged in saidslots, a projection on the said disk, a nut mounted rotatably on thesaid casing, a screw in the said nut, one end of the said screwconstituting a hook for engaging the said projection, and a pivotedlever adapted to push the said hooked end of the said screw away fromthe said projection.

ANTOINE SIGALON. Vitnesses RAoUL ConoAs, EUGENE WA'ITERS.

